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Waste Water Engineering

Waste Water Engineering
If the depletion of oxygen is found to be 5 ppm after incubating a 2.5% solution of sewage sample for 5 days at 21°C, B.O.D. of the sewage is

50 ppm
200 ppm
100 ppm
150 ppm

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Waste Water Engineering
The sewer pipe which carries sewage from a building for immediate disposal is

Lateral sewer
Main sewer
Intercepting sewer
House sewer

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Waste Water Engineering
The temperature affects the

All of these
Biological activity of bacteria in sewage
Solubility of gases in sewage
Viscosity of sewage

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Waste Water Engineering
The sewerage system consists of

All of these
Branch sewer
Lateral sewer
House sewer

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Waste Water Engineering
The normal value of over flow rates for plain primary sedimentation tanks, ranges between

50,000 to 60,000 litres/sqm/day
40,000 to 50,000 litres/sqm/day
25,000 to 35,000 litres/sqm/day
80,000 to 100,000 litres/sqm/day

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Waste Water Engineering
In sewers the gas generally found, is

Carbon dioxide (CO2)
All listed here
Methane (CH4)
Hydrogen sulphide (H2S)

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